CVE-2026-30913 MEDIUM

CVE-2026-30913: flarum/nickname: Display name injection in notification emails (autolink & markdown)

Vendor Flarum

Product nicknames

Weakness CWE-79 · XSS

Published March 9, 2026

Last update March 10, 2026

View on NVD All CVEs

CVSS base score

4.6/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction Required

Confidentiality Low

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

Flarum is open-source forum software. When the flarum/nicknames extension is enabled, a registered user can set their nickname to a string that email clients interpret as a hyperlink. The nickname is inserted verbatim into plain-text notification emails, and recipients may be misled into visiting attacker-controlled domains.

Key dates

02Disclosure timeline

March 9, 2026 CVE published

March 10, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-30913 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html

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